78 wont spark

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Dec 19, 2009 | 05:36 PM

coz

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Joined: Dec 2009

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78 wont spark

Ok here we go.

owned truck for two days Ran good when i got it home now no spark.

Replaced pickup in distributor
Icu
starter relay
Cleaned ground behind icm
I have power to icm key on
I have power to icm on key start
power to both sides of the coil

Put light on Tach test it doesnt flash, it lights up when key is in on position and stays solid while cranking. (you can see it flickering a bit from the starter draw)

Anybody have any further input

Thanks

Dec 19, 2009 | 05:41 PM

FLATFORD1976

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Joined: Jul 2009

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did you say you replaced the icm

Dec 19, 2009 | 06:34 PM

montana_highboy

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Joined: Apr 2008

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From: Big Sky Country

Bad coil.......

Dec 19, 2009 | 07:20 PM

coz

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yes replaced icm have 3 on hand all same results.... will try coil

Dec 20, 2009 | 05:54 PM

coz

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Changed out coil........... no results

Dec 21, 2009 | 07:52 PM

terryk78

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Joined: Jan 2007

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From: Moore OK

Mine did that also. I had a bad wire from the coil,it had a few broken wires
Also the connection to the distributor had some broken wires, just enough where it wasn't making spark

Dec 28, 2009 | 05:28 PM

coz

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Ended up being a bad ground wire on the disributor somewhere in the taped wires. I replaced the wire and did the old chevy camaro hei module trick... Night and day

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